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If `a+b+c=0` prove that `(a^4+b^4+c^4)/(a^2b^2+b^2c^2+c^2a^2)=2`
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If `a+b+c=0` prove that `(a^4+b^4+c^4)/(a^2b^2+b^2c^2+c^2a^2)=2`
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